update project after learning https://github.com/OthmanAdi/planning-with-files/

更新skills到.cursor

add some skills after learning spec-kit

增加实施计划编写和子代理驱动开发的skills

update after learning from ECC（everything-claude-code project）

learning Every-Cluade-Code

add doc lookup skills with Context7

delete bad skills

feat: add multimodal-rag-development best practices skill

feat: add ai-agent-security best practices skill

feat: add mcp-server-patterns best practices skill

feat: add backend architecture patterns best practices skill

feat: add universal coding standards best practices skill

feat: add api-design best practices skill

更新前端skills